Transient analysis of reverse-circulation air drilling

Junyang Zhou, Michael A. Adewumi

Research output: Contribution to conferencePaperpeer-review


Several transient scenarios in reverse-circulation air drilling are investigated using a multiphase hydrodynamic model. This model, which comprises a strictly hyperbolic set of equations for transient 1-D gas-solids flow in pipes, with pressure drop in the gas phase only and the inclusion of a particle phase pressure gradient term in the particle phase momentum equation is solved in the conservative form using a high-resolution higher-order hybrid TVD/Roe scheme. Characteristic equations of this model in both the primitive and conservative variables are presented. The characteristic boundary method is used to handle the boundary conditions at both ends of a drill pipe. A computer code is developed based on the numerical schemes and the treatment of boundary conditions. The simultaneous existence and propagation of pressure wave and continuity wave have been captured. The predicted results are quite reasonable and shed some light on the physical behavior of the field scale systems under transient excitations.

Original languageEnglish (US)
StatePublished - Jan 1 1998
EventProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting - Washington, DC, USA
Duration: Jun 21 1998Jun 25 1998


OtherProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting
CityWashington, DC, USA

All Science Journal Classification (ASJC) codes

  • General Engineering


Dive into the research topics of 'Transient analysis of reverse-circulation air drilling'. Together they form a unique fingerprint.

Cite this